Nikon 20mm f3.5 Nikkor-UD  type_Projectors there is no way to

there is no way to focus it

except a "#1" inscribed on the bottom plate for some reason

it’s because this lens has some lightly radioactive glass elements

It features a red-digit digital display and glow-in-the-dark buttons

as is the leather case (which shows a bit more cosmetic wear)

Nikon 20mm f3.5 Nikkor-UD &nbsptype_Projectors there is no way toThe Nikon 20mm f3. 5 Nikkor UD is a pre AI, manual focus ultrawide lens for Nikon F mount. In excellent condition, with minor internal dust, very minor paint wear. This is a pre AI lens, so you'll want to check your camera's instruction manual to make sure that it's mountable (or ask us).